# Question A 3-phase induction motor runs at a speed of 1485 rpm at no-load and at 1350 rpm at fullload when supplied from a 50-Hz, 3-phase line. (a) How many poles does the motor have? (b) What is the % slip at no-load and at fullload? (c) What is the frequency of rotor voltages at no-load and at full-load? (d) What is the speed at both no-load and fullload of: (i) the rotor field with respect to rotor conductors, (ii) the rotor field with respect to the stator, and (iii) the rotor field with respect to the stator field.

ZTRDCK The Asker · Electrical Engineering
A 3-phase induction motor runs at a speed of 1485 rpm at no-load and at 1350 rpm at fullload when supplied from a 50-Hz, 3-phase line.   (a) How many poles does the motor have?   (b) What is the % slip at no-load and at fullload?   (c) What is the frequency of rotor voltages at no-load and at full-load? (d) What is the speed at both no-load and fullload of: (i) the rotor field with respect to rotor conductors, (ii) the rotor field with respect to the stator, and (iii) the rotor field with respect to the stator field.
Transcribed Image Text: A 3-phase induction motor runs at a speed of 1485 rpm at no-load and at 1350 rpm at fullload when supplied from a 50-Hz, 3-phase line. (a) How many poles does the motor have? (b) What is the % slip at no-load and at fullload? (c) What is the frequency of rotor voltages at no-load and at full-load? (d) What is the speed at both no-load and fullload of: (i) the rotor field with respect to rotor conductors, (ii) the rotor field with respect to the stator, and (iii) the rotor field with respect to the stator field.
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Transcribed Image Text: A 3-phase induction motor runs at a speed of 1485 rpm at no-load and at 1350 rpm at fullload when supplied from a 50-Hz, 3-phase line. (a) How many poles does the motor have? (b) What is the % slip at no-load and at fullload? (c) What is the frequency of rotor voltages at no-load and at full-load? (d) What is the speed at both no-load and fullload of: (i) the rotor field with respect to rotor conductors, (ii) the rotor field with respect to the stator, and (iii) the rotor field with respect to the stator field.